# Math Help - Easy question about graphing a cos function

1. ## Easy question about graphing a cos function

How to graph y=(cos^2)(x)

i know there is a way to rewrite this function so i can plug it into my calculator to graph it but i dont remember how to rewrite it.

is it maybe something like y=2cosx or maybe y=cosx^2????

thank you

2. Originally Posted by mybrohshi5
How to graph y=(cos^2)(x)

i know there is a way to rewrite this function so i can plug it into my calculator to graph it but i dont remember how to rewrite it.

is it maybe something like y=2cosx or maybe y=cosx^2????

thank you

if using a TI, the correct syntax is ... $Y_1 = \cos(x)^2$
$\cos^2{x} = \frac{1+\cos(2x)}{2}$